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0,72 + 0,06x=1,2 /-0,72
0,06x=0,48 /*100
6x=48 /÷ 6
x=8
0% + 10% = 6%
y + 12 = 12 + y
( 0% × y) + ( 10% × 12 ) = 6% × ( 12 + y )
1.2 = 0.72 + 0.06y
0.48 = 0.06y / ÷ 6
0.08 = 0.01y / × 100
8 = y
odp.Należy dolać 8 litrów wody